projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 84e3ad5b VB |
1 | /* |
| 2 | * This file contains low level CPU setup functions. | |
| 3 | * Valentine Barshak <vbarshak@ru.mvista.com> | |
| 4 | * MontaVista Software, Inc (c) 2007 | |
| 5 | * | |
| 6 | * Based on cpu_setup_6xx code by | |
| 7 | * Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License | |
| 11 | * as published by the Free Software Foundation; either version | |
| 12 | * 2 of the License, or (at your option) any later version. | |
| 13 | * | |
| 14 | */ | |
| 15 | ||
| 16 | #include <asm/processor.h> | |
| 17 | #include <asm/cputable.h> | |
| 18 | #include <asm/ppc_asm.h> | |
| 19 | ||
| 8112753b VB |
20 | _GLOBAL(__setup_cpu_440ep) |
| 21 | b __init_fpu_44x | |
| 22 | _GLOBAL(__setup_cpu_440epx) | |
| 340ffd26 VB |
23 | mflr r4 |
| 24 | bl __init_fpu_44x | |
| 25 | bl __plb_disable_wrp | |
| 26 | mtlr r4 | |
| 27 | blr | |
| 28 | _GLOBAL(__setup_cpu_440grx) | |
| 29 | b __plb_disable_wrp | |
| 30 | ||
| 8112753b VB |
31 | |
| 32 | /* enable APU between CPU and FPU */ | |
| 33 | _GLOBAL(__init_fpu_44x) | |
| 34 | mfspr r3,SPRN_CCR0 | |
| 35 | /* Clear DAPUIB flag in CCR0 */ | |
| 36 | rlwinm r3,r3,0,12,10 | |
| 37 | mtspr SPRN_CCR0,r3 | |
| 38 | isync | |
| 39 | blr | |
| 40 | ||
| 340ffd26 VB |
41 | /* |
| 42 | * Workaround for the incorrect write to DDR SDRAM errata. | |
| 43 | * The write address can be corrupted during writes to | |
| 44 | * DDR SDRAM when write pipelining is enabled on PLB0. | |
| 45 | * Disable write pipelining here. | |
| 46 | */ | |
| 47 | #define DCRN_PLB4A0_ACR 0x81 | |
| 48 | ||
| 49 | _GLOBAL(__plb_disable_wrp) | |
| 50 | mfdcr r3,DCRN_PLB4A0_ACR | |
| 51 | /* clear WRP bit in PLB4A0_ACR */ | |
| 52 | rlwinm r3,r3,0,8,6 | |
| 53 | mtdcr DCRN_PLB4A0_ACR,r3 | |
| 54 | isync | |
| 55 | blr | |
| 56 |